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BMC: Fourstroke 01 Frameset - 2017
BMC: Fourstroke 01 Frameset - 2017
The Fourstroke is one of the very few full-suspension mountain bikes to win the XCO World Championships. That alone sets it apart as an outstanding race bike. The combination of BMC's Big Wheel Concept (BWC) geometry and Advanced Pivot System (APS) suspension design makes for an incredibly fast and capable XC or Marathon race bike. If there is one category the Fourstroke belongs to, it is quite simply racing.
|Frame||APS (Rear Travel 100mm)|
|Tubing||Carbon / Carbon|
|Size||S / M / L|
The Fourstroke is BMC's most pedal-focused APS platform - with superior small-bump performance and maximum efficiency for amazing traction and aggressive accelerations.
The Fourstroke 01’s full-carbon dropouts are designed for a 12x142mm through-axle system and are assembled with specific Shimano or Sram direct-mount derailleur hangers depending on the groupset.
The 1-½” headtube compliments the BWC recipe of long reach, a short stem and wide handlebars for great front-end handling.
APS Advanced Pivot System
A well-designed full suspension bike offers the control and confidence to ride a trail without hesitation. Ideal suspension systems maximize pedaling efficiency without compromising the ability to soak up the bumps. BMC's solution is the Advanced Pivot System (APS) which optimizes kinematics and pivot placements, leverage ratios, axle paths and shock dimensions. Iterative calculations fine-tune all the suspension properties of each of our distinctive full-suspension models to achieve the best ride characteristics for any terrain. The result is a light, stiff and compact structure that promotes excellent control and energy transfer for the rider.
When accelerating, an inertial force is generated which attempts to compress the shock system. BMC's APS solution counteracts this effect. It carefully calculates the pivot points of the rear suspension so that inertial force generated under acceleration is not misdirected into compressing the shock, instead, the chain tension compensates for this effect. As a result, all the pedal power is used for propulsion without any loss of energy through the suspension. The shock system ensures optimum traction, and therefore ensures that power is transferred to the ground.
- Traction- To achieve just the right amount of travel for each of our distinct models BMC optimized the leverage ratio, ensuring the optimal balance between progression and small bump sensitivity.
- Control- Low suspension ratio means greater oil flow and energy dissipation. Pick your line and let the bike do the rest.
- Efficiency- There is a lot to be said for keeping the rubber side down. With less time in the air you cover ground faster.
BWC Big Wheel Concept
Winning performances are much more than just a tire size, its how wheels are integrated into a complete bike. BMC's Big Wheel Concept maximizes the rolling benefits of 29 wheel sizes and maintains a playful and nimble feel through purposeful geometry and cockpit tweaks. Low bottom bracket and short chainstays promote excellent traction and control while a roomy toptube and short stem promote a confident rider position. BWC focuses on the elements that transfer the benefits of big wheels onto the trails.
- Greater agility- Cornering becomes instinctive, not just a reaction as you lean in the bike moves with you.
- Increased stability- Both wheels on the ground, letting you take more risks and of course, go faster.
The demands of cross country mountain bike racing require a maneuverable machine that inspires confidence when you scream down the final descent into a sprint finish. A long top tube, slack head tube angle and a wide bar paired with short stem and chainstays is our recipe for making big wheels roll fast and turn easily. The entire Fourstroke family is built around this super progressive approach to bike geometry.
Chasing the podiums of World Cup races is all about maximizing technical advantages. A frame that weighs merely 2.5 kilos is a fantastic place to start. Advancements in carbon technology combined with the skill of our Impec Lab’s engineers resulted in an industry and race-leading machine for XC and Marathon mountain bike racing.
Our Advanced Pivot System (APS) for the Fourstroke family focuses on efficiency and reducing rider fatigue. APS’s high tech design promotes extreme pedaling efficiency. How extreme? World Champion extreme. Thanks to the efficiency of APS, the Fourstroke is one of the only full-suspension bikes in the world to have won the XCO World Championships.
- Frame: Fourstroke 01 Premium Carbon Frame (F&R) - 100mm
- Frame Technology Advanced Pivot System Suspension and Big Wheel Concept Geometry
- Sizes: 3 sizes: S / M / L
- Frame Weight: 2040g (M)**
- Frame: DTi compatible, Integrated single-ring chain guide, Internal routing for lockout, Initial Load Indicator
- Frame: 12 x 142mm Thru-axle (Shimano)
- Fork: Tapered steerer 1-1/8” to 1-1/2”, 51mm offset
- Seatpost: 31.6mm
- Bottom Bracket: PF92
- Brakes: Natural-born postmount 160 / 180***
- Drivetrain: Bottom-pull front derailleur - High-direct, type mount, Replaceable standard or direct mount rear derailleur hangers
- Tires: 2.25” maximum width****
- Misc.: 200mm x 50mm shock dimensions, 21.84mm x 8mm hardware, 36T maximum chainring, single ring drivetrain
**Average sample weight with hardware
***Rotor sizes adapted for some frame sizes
****Tire dimensions based on measured tire width
*Detail images to display frame only, not color
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